Table of Contents
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Contents
Digital I/O State Selection............................................................................................... 3-9
High DIO State.................................................................................................. 3-9
Low DIO State .................................................................................................. 3-10
Floating DIO State ............................................................................................ 3-11
Timing Specifications...................................................................................................... 3-12
Mode 1 Input Timing ........................................................................................ 3-13
Mode 1 Output Timing ..................................................................................... 3-14
Mode 2 Bidirectional Timing............................................................................ 3-15
Chapter 4
Interrupt Control Circuitry .............................................................................................. 4-2
USB Microcontroller ....................................................................................................... 4-2
82C55A Programmable Peripheral Interface .................................................................. 4-2
Digital I/O Connector ...................................................................................................... 4-3
Appendix B
Appendix D
Figures
DAQPad-6507/6508 User Manual
NI-DAQ, and Your Hardware................................................................. 1-5
Your DAQPad Device ........................................................................... 2-2
vi
© National Instruments Corporation
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